/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2017-2025 Ta4j Organization & respective
 * authors (see AUTHORS)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.ta4j.core.serialization;

import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;

import java.io.IOException;
import java.time.Duration;

/**
 * Custom Gson TypeAdapter for serializing and deserializing {@link Duration}
 * objects. Serializes Duration to its ISO-8601 string representation (e.g.,
 * "PT1H30M") and deserializes it back.
 *
 * @since 0.19
 */
public class DurationTypeAdapter extends TypeAdapter<Duration> {

    @Override
    public void write(JsonWriter out, Duration value) throws IOException {
        if (value == null) {
            out.nullValue();
        } else {
            out.value(value.toString());
        }
    }

    @Override
    public Duration read(JsonReader in) throws IOException {
        if (in.peek() == com.google.gson.stream.JsonToken.NULL) {
            in.nextNull();
            return null;
        }
        String durationString = in.nextString();
        return Duration.parse(durationString);
    }
}
